Oct. 30, 2017

hairgrass, Avenella flexuosa

Hairgrass is a wildly successful species that has me a little puzzled. Wikipedia says this grows on every continent except Australia and Antarctica. Flora of North America limits it to North and South America, Borneo, the Philippines and New Zealand. On top of that it's listed in WoRMS (World Register of Marine Species). This is a species of dry, often rocky slopes, woods, and thickets. Perhaps the WoRMS listing is because it has moved in with the penguins on South Georgia. Avenella was recently separated from the genus Deschampsia. Maybe that study also separated D. flexuosa from it's Eurasian and African kin. Here it grows in AK, AL, AR, CT, DE, GA, KY(T), MA, MD, ME, MI, MN, NC, ND, NH, NJ, NY, OH, OK, PA, RI, SC, TN, VA, VT, WI, WV, BC, LB, NB, NF, NS, ON, PE, QC, GL, and SPM. Keweenaw Co MI, 7/12/14.